CLIMATE CHANGE AND SEA LEVEL RISE: IMPACTS TO WETLANDS. Juliana BarreB ConnecDcut Sea Grant UConn Extension
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1 Call of the Wild
2 CLIMATE CHANGE AND SEA LEVEL RISE: IMPACTS TO WETLANDS Juliana BarreB ConnecDcut Sea Grant UConn Extension
3
4 Changes in climate are changing plant and animal ranges, migradons on land and water systems disrupdng food webs increasing pathogens, parasites and disease changing exdncdon risks impacdng hydrologic regimes All of which change ecosystems and ecosystem services
5 In the US, spring now arrives 10 to 14 days earlier than it did 20 years ago Obvious changes related to the Dming of the seasons: when plants bud in spring; when birds and other animals migrate ShiWs in tree species on mountains in New England (largely in the transidon zones) ShiWs in fish populadons as rivers warm
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7 In nature, Dming is everything. It can influence recreadon, agriculture even economics. Whether people come to see the fall colors, watch migradng whales or catch a glimpse of rare birds, visitors to the Northeast impact the economy to the tune of millions of dollars. As the Dming of nature s events change, so will the Dming of the tourist seasons.
8 Habitats at the Highest Risk from Climate Change in Connec5cut 1. Cold Water Streams 2. Tidal Marsh 3. Open Water Marine 4. Freshwater Wetlands 5. Forested Swamps 6. Major Rivers 7. Beaches and Dunes 8. Offshore Islands From: The Impacts of Climate Change on ConnecDcut Agriculture, Infrastructure, Natural Resources and Public Health 2010
9 Wetland Functions and Values
10 Climate change impacts that will affect wetlands Increased mean annual air temperatures Changes in precipitadon paberns (amount, Dming, intensity) Increases in average water temperatures Sea level rise Intense storm events (hurricanes, nor easters)
11 Wetlands represent a significant storage reservoir of carbon in the global carbon cycle While covering only 3% of the World's land area, peatlands contain at least 550 Gt of carbon in their peat. This is equivalent to 30% of all global soil carbon, 75% of all atmospheric C, equal to all terrestrial biomass, and twice the carbon stock in the forest biomass of the world. This makes peatlands the top long-term carbon store in the terrestrial biosphere. From Peat Portal.net
12 Climate Change and Disturbance to Wetlands Wind damage to wetland forests in the Pearl River Basin caused by Hurricane Katrina changed carbon sinks to carbon sources Louisiana State University
13 Less winter precipitadon falling as snow and more as rain will change hydrologic regimes Reduced snowpack and earlier breakup of winter ice on lakes and rivers Earlier spring snowmelt leading to earlier peak river flows Ground water levels, runoff, soil moisture Sea level rise
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15 Coastal Wetlands Horizontal and verdcal accredon New England salt marshes lible sediment, dependent on primary producdvity for verdcal accredon Threshold (Plum Island): 5mm/yr SLR SLR: about 4.5 mm/yr in the last decade So the issue is where can the marshes go horizontally?
16 SLAMM Model Process Overview (Sea level affecdng marshes model) InundaDon: Calculated based on the minimum elevadon and slope of the cell. Erosion: Triggered given a maximum fetch threshold and proximity of the marsh to estuarine water or open ocean. AccreDon: VerDcal rise of marsh due to buildup of organic and inorganic maber on the marsh surface. Rate differs by marsh- type. Salinity: OpDonal model or linkage to exisdng model. Salinity affects habitat switching in areas with significant freshwater flows Overwash: Barrier islands undergo overwash at a fixed storm interval. Beach migradon and transport of sediments are calculated. SaturaDon: MigraDon of coastal swamps and fresh marshes onto adjacent uplands- - response of the water table to rising sea level.
17 The Surface ElevaDon Table (SET) is a portable mechanical leveling device for measuring the reladve elevadon change of wetland sediments.
18 Changes at Barn Island Stonington, CT Changes in high marsh to low marsh, low marsh to mud flat Marsh migradon scenarios/ management scenarios (constraints on landward side)
19 ConnecDcut River Salt wedge may move further upriver with sea level rise. Some of the freshwater Ddal wetlands may transidon to brackish, and brackish wetlands to salt marshes. Changes in the Dming of the spring freshet will also impact wetlands.
20 Vernal pools may decrease in size or dry up Wetland types may change such as from marsh to forest Associated flora and fauna may change as wetlands change
21 What can we do? IdenDficaDon of at risk wetlands statewide (eg Ddal marshes, vernal pools, shallow to groundwater wetlands, poor fens)
22 Vegetated buffers and setbacks
23 Tidal marshes protecdon of surrounding land to allow for marsh migradon (depending on elevadons)
24 Wetlands restoradon
25 Wetlands protecdon
26 Control of Invasive Species
27 Invasive species ecological and economic impacts Purple LoosesDfe: It has been spreading at a rate of 115,000 ha/year and has been blamed for reducing the biomass of 44 nadve plants and endangered wildlife, including bog turtles and several species of ducks that depend on nadve plants. Loosestrife now occurs in 48 states and costs $45 million per year in control costs and forage losses.
28 Drop pipe Water Control Structures Flap gate structure Flash boards or stoplogs
29 Of all aquatic systems, wetlands will likely be the most susceptible to climate change. Shallow wetlands that are dependent on precipitation will be the most vulnerable to drying, warming and changes in water quality. Intermittent and perennial streams, vernal pools, and coastal wetlands and marshes will also be particularly vulnerable to projected changes in temperature, precipitation and sea level rise. Lawler, J.J., et al. 2008
30 Wetlands and Global Scale Changes Wetlands are significant sources and sinks of greenhouse gases and play an important role in global climate change Wetlands are very vulnerable to the effects of global climate change Sea level rise driven by climate change is the greatest threat to coastal wetlands Increases in temperature pose the greatest threat to inland wetlands
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